code: def testCombineTensorBatch(self):
      with tf.Graph().as_default():
          tensor = tf.constant([[1, 2, 3, 0, 0], [4, 5, 0, 0, 0]])
          lengths = tf.constant([3, 2])
          combined = data.combine_tensor_batch(
              tensor, lengths, max_length=5, batch_size=2
          )
          sess = tf.Session()
          np.testing.assert_equal(
              [1, 2, 3, 4, 5, 0, 0, 0, 0, 0], sess.run(combined)
          )
  
imports: import copy
  import tempfile
  import time
  from magenta.models.onsets_frames_transcription import configs
  from magenta.models.onsets_frames_transcription import constants
  from magenta.models.onsets_frames_transcription import data
  from note_seq import audio_io
  from note_seq import sequences_lib
  from note_seq import testing_lib
  from note_seq.protobuf import music_pb2
  import numpy
  import tensorflow.compat.v1
label_desc: Use image node_id 15 for calling the DataTest obj's underlying member method code with example usage: obj.testCombineTensorBatch() without return types